:root {
  --ink: #1C2B33;
  --paper: #F6F3EC;
  --card: #FFFFFF;
  --border: #E3DFD3;
  --border-soft: #F0EDE4;
  --muted: #8C877B;
  --accent: #B9542A;
  --good-bg: #DCE7E1; --good-fg: #2F5D48;
  --bad-bg: #F2DAD4; --bad-fg: #8C3A2C;
  --draft-bg: #EDEAE2; --draft-fg: #6B655A;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--paper);
  color: var(--ink);
}
a { color: inherit; }
input, textarea, select {
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 10px;
  font-size: 14px;
  background: white;
  color: var(--ink);
  width: 100%;
}
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--accent); }
label { font-size: 12px; color: var(--muted); font-weight: 600; display: block; margin-bottom: 5px; }
.field { margin-bottom: 12px; }
button, .btn {
  font-family: inherit;
  cursor: pointer;
  border: none;
  border-radius: 6px;
  padding: 10px 16px;
  font-weight: 600;
  font-size: 14px;
  background: white;
  border: 1px solid #D8D3C7;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-primary { background: var(--accent); color: white; border: none; }
.btn-danger { color: var(--bad-fg); }

.layout { display: flex; min-height: 100vh; }
.sidebar { width: 210px; flex-shrink: 0; border-right: 1px solid var(--border); padding: 20px 14px; }
.sidebar .brand { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .12em; color: var(--accent); font-weight: 700; }
.sidebar .bizname { font-size: 15px; font-weight: 700; margin: 2px 0 24px; line-height: 1.25; }
.sidebar nav a {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: 6px; margin-bottom: 2px;
  font-size: 14px; font-weight: 500; color: #4A4640; text-decoration: none;
}
.sidebar nav a.active { background: var(--ink); color: var(--paper); }
.main { flex: 1; min-width: 0; padding: 32px 40px; max-width: 1000px; }
h1 { font-size: 26px; font-weight: 800; margin: 0 0 4px; }
.subtitle { color: var(--muted); font-size: 14px; margin-bottom: 24px; }
.page-head { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 20px; }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 8px; }
.card-pad { padding: 18px 20px; }
.list-row {
  display: flex; align-items: center; gap: 16px;
  padding: 12px 18px; border-bottom: 1px solid var(--border-soft);
  text-decoration: none; color: inherit;
}
.list-row:hover { background: #FAF8F3; }
.list-row:last-child { border-bottom: none; }
.empty { padding: 24px; color: var(--muted); font-size: 14px; }

.tag { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .08em; padding: 3px 8px; border-radius: 3px; font-weight: 600; text-transform: uppercase; display: inline-block; }
.tag-draft { background: var(--draft-bg); color: var(--draft-fg); }
.tag-sent { background: var(--good-bg); color: var(--good-fg); }
.tag-overdue, .tag-declined { background: var(--bad-bg); color: var(--bad-fg); }
.tag-paid, .tag-accepted { background: var(--good-bg); color: var(--good-fg); }

.stat { flex: 1; }
.stat .label { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .08em; color: var(--muted); text-transform: uppercase; }
.stat .value { font-size: 26px; font-weight: 700; margin-top: 6px; }

.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.auth-card { width: 340px; background: white; border: 1px solid var(--border); border-radius: 10px; padding: 28px; }
.auth-card h1 { font-size: 20px; }
.auth-card .brand { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: .12em; color: var(--accent); font-weight: 700; margin-bottom: 6px; }

.flash-error { background: var(--bad-bg); color: var(--bad-fg); padding: 10px 14px; border-radius: 6px; font-size: 13px; margin-bottom: 16px; }
.flash-ok { background: var(--good-bg); color: var(--good-fg); padding: 10px 14px; border-radius: 6px; font-size: 13px; margin-bottom: 16px; }

@media (max-width: 720px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border); padding: 12px 14px; }
  .sidebar nav { display: flex; overflow-x: auto; gap: 4px; }
  .sidebar nav a { white-space: nowrap; }
  .sidebar .bizname { display: none; }
  .main { padding: 20px; }
}